Manley pistons are machined of high strength 2618 material. Each design is lightweight yet robust enough to deliver long service life. Offset wrist pin design is utilized for quiet start-ups. Perfect ring groove to skirt squareness is achieved through our unique "one fixturing" manufacturing method that assures maximum horsepower. All GT-R pistons come with moly coated skirts. round wire locks, premium chrome moly wrist pins, and rings. 9310 alloy upgraded wrist pins are available.


  • 2618 high strength material
  • Offset wrist pin for quiet start-ups
  • 2.500" x .180" wall Premium Chrome Moly pin included P/N 42346
  • 9310 alloy .210" wall pin upgrades available P/N 42546
  • Pressure balance groove
  • Will accommodate +1mm valve size
  • .260 Crown thickness
  • Round wire locks included


An Industry First! These pistons feature skirt diameters that correspond to the OEM Grade 1, 2 or 3 bores. Check the bore grades on the back of your block and order the appropriate quantities of Grade 1, 2 or 3 pistons. (Sold as -1 individual pieces, not sets.)

Manley GTR forged pistons